High School Level Science

Chargraff's rule states that

Chargraff's rule states that

A.   adenine pairs with thymine and guanine pairs with uracil 
B.   adenine pairs with thymine and guanine paris with cytosine 
C.   adenine and guanine both pair with thymine 
D.   adenine pairs w

Isuckatbiology   660   1 Reply

Doctor-2-B

high blood glucose levels in untreated diabetes mellitu can tolead

high blood glucose levels in untreated diabetes mellitu can tolead

Long-term effects of high blood glucose levels in untreated diabetes mellitus individuals can lead to?
   I think it is A OR B
A,blindness, nerve damage, and weight gain

   
B,gangrene, and digital or limb amputations, blindness

KONJO369   805   4 Replies

angie19

Human Development! bio 30 HELP

Human Development! bio 30 HELP

The process that might occur under normal conditions in, and only in, the structure labelled W is

a.menstruation
b.fertilization
c.implantation
d.ovulation

please help! i have attached the picture

jasminex0   439   2 Replies

salax0

I tried these question but still don't know the answer please help!

I tried these question but still don't know the answer please help!

sorry i have a lot of questions, but i really need help!

A curious child touched the outside of a barbecue grill containing red-hot coals. Before he was even aware of what happened, he jerked his hand away. A second or two later, he felt p

DRANZERBERG   5194   3 Replies

bio_man

Intraspecific competition limits a population size a

Intraspecific competition limits a population size a

1. Intraspecific competition limits a population size a
a) clumped distribution decreases competition, which removes "weak" and old individuals from the population
b) competition for resources intensifies as two different species

princess001   6335   5 Replies

bio_man

what statement attached is completed by the information below

what statement attached is completed by the information below

#7      A positively charged test object is placed in the electric field caused by a (-) charged object. The test object is to the left of the negatively charged object. At the position of the test object, the correct direction of

angie19   419   N/A

angie19

what was Jean- Baptiste Lamarck contribution to our knowledge of evoulution

what was Jean- Baptiste Lamarck contribution to our knowledge of evoulution

my question is that i have to select three of the following to explain  the following major contribution to our knowledge of evolution.

G.L. Buffon
Georges Cuvier
Charles Lyell ( finished)
Jean- Baptiste Lamarck
Th

katty   1678   4 Replies

bio_man

What was the genotype of the male parent in this cross?

What was the genotype of the male parent in this cross?

In Drosophilia ebony body colour is caused by the recessive allele eb and grey body colour by the dominant allele eb+. Vestigal wings are produced by the recessive allele vg and long wings by the dominant allele vg+.

When mated, a female w

fosmanali01   2953   2 Replies

fosmanali01

which test would likely solve the problem of identifying the father?

which test would likely solve the problem of identifying the father?

two men each claimed the same children as his own. the blood types of the men, the children, and their mother were known. which test would likely solve the problem of identifying the father?
A. chromosome mapping
B. DNA  fingerprinting

EA   454   1 Reply

melman12

Which Wavelength Has the Greatest Amount of Energy?

Which Wavelength Has the Greatest Amount of Energy?

The image of the wavelengths is in the attachment below.

 I selected Choice A as from my understanding, the more frequent a wave is, the more energy it has. Is that correct and if not, how do you figure out which wave has the greatest amou

Zlovespigs   88   2 Replies

Zlovespigs

"Local observations made in an accelerated frame of reference cannot be distinguished from ...

"Local observations made in an accelerated frame of reference cannot be distinguished from ...

"Local observations made in an accelerated frame of reference cannot be distinguished from observations made in a gravitational field" is known as the principle of
A) equivalence.
B) equality.
C) equanimity.
D) interchangeability.

ChesterNeupt   279   2 Replies

ChesterNeupt

"Sympathetic vibrations" refers to

"Sympathetic vibrations" refers to

"Sympathetic vibrations" refers to
A) beats.
B) interference.
C) pitch.
D) resonance.

kg0923   43   2 Replies

kg0923

#19. In cattle, the polled, or hornless trait(P) is dominant over the horned trait(p)... #20

#19. In cattle, the polled, or hornless trait(P) is dominant over the horned trait(p)... #20

#19. In cattle, the polled, or hornless, trait (P) is dominant over the horned trait (p).
In an ideal cattle population exhibiting Hardy–Weinberg equilibrium, 23 out of every 125 calves are horned. Calculate the frequency of the recessive allel

Aliya1   717   5 Replies

Smashknee

#2. Use the following information to answer the next two questions

#2. Use the following information to answer the next two questions

#2. Use the following information to answer the next two questions.

In garden pea plants, tall stem height (T) is dominant over short stem height (t), and green pod colour (G) is dominant over yellow pod colour (g).


Some

Aliya1   132   1 Reply

bio_man

#35 &#36 - Genetics- Polygenic Traits

#35 &#36 - Genetics- Polygenic Traits

Hi, i added questions #35 and #36 by accident in my last post 
Here's #35. Use the following information to answer the next two questions.

Feather colour in parakeets is controlled by two genes. Blue colour (B) i

Aliya1   142   2 Replies

bio_man

#36.Which of the following statements correctly describes the conditions of microevolution?Select

#36.Which of the following statements correctly describes the conditions of microevolution?Select

#36.Which of the following statements correctly describes the conditions of microevolution?

Select one:
a. Mates are chosen based on specific traits, and the bottleneck effect is prevented.
b. Mutations happen randomly, and the e

Aliya1   184   6 Replies

Aliya1

#6.Nucleic acids such as DNA are polymers of nucleotides. #7.DNA sequence

#6.Nucleic acids such as DNA are polymers of nucleotides. #7.DNA sequence

#6.Nucleic acids such as DNA are polymers of nucleotides .Each nucleotide consists of a five-carbon sugar bonded to a nitrogen base and a phosphate molecule. Each carbon on the sugar is numbered with primes according to chemical convention. Which car

Aliya1   251   6 Replies

Shari Bowey

"Proteins, not DNA, are the key to cell specialization." What does this statement mean

"Proteins, not DNA, are the key to cell specialization." What does this statement mean

"Proteins, not DNA, are the key to cell specialization.”
what's exactly meant by this statement?

smartie22   779   1 Reply

bio_man

"Understanding Biology" textbook

"Understanding Biology" textbook

Hello, I was just wondering if anyone out there knows this textbook?

It is called Understanding Biology, published by Times Mirror Mosby and by Raven & Johnson.
Appearently it was used in the old OAC biology course in Ontario, but

rainbows246   3433   4 Replies

rainbows246

(a)biotic factor

(a)biotic factor

1. Give an example of how (a) an abiotic factor and (b) biotic factor can limit population growth.
2. Give an example of (a) biome, (b) an ecosystem within the biome, and (c) a community within this ecosystem.

craiczarry   395   1 Reply

biochicka

*URGENT* Population genetics

*URGENT* Population genetics

1. In sheep, white wool is dominant trait and black wool is a recessive trait. In a herd of 500 sheep, 20 sheep have black wool. In this herd what is the frequency of the heterozygous genotype?


2. Genetics estimate that 1 in 2500 ca

sciencetriofosh   1045   1 Reply

hairykiller

......

......

1,The fight-or-flight response is a

A,short-term stress response regulated by the hormone epinephrine

   
B,long-term stress response regulated by the hormone ACTH

   
C,short-term stress response regulated by t

KONJO369   467   2 Replies

jaykhaled_

1 multiple choice AP Biology question? please please please help? :(?

1 multiple choice AP Biology question? please please please help? :(?

Which is true about logistic growth within a community?


A) is not affected by density-dependent factors

B) reflects natural conditions of population growth

C) is independent of carrying capacity changes within a population

D) responds to both na

_biology   755   1 Reply

onyinye

1 out of 2400 babies that were born at a maternity hospital died shortly after birth from colonic ...

1 out of 2400 babies that were born at a maternity hospital died shortly after birth from colonic ...

1. 1 out of 2400 babies that were born at a maternity hospital died shortly after birth from colonic obstruction due to a recessive allele. Determine the frequency of the lethal allele in the population, expressed as a percent.

(Round your

manbearpig   2244   1 Reply

bio_man

1 QUESTION ABOUT NICHES PLS

1 QUESTION ABOUT NICHES PLS

1. Many of the endangered species in the world have very specific, or narrow, ecological niches. Explain why species with narrow ecological niches are more likely to become extinct than species with broader ecological niches.

biochicka   318   1 Reply

majmerlin

1. How many possible codons can be formed from the 4 bases in mRNA?

1. How many possible codons can be formed from the 4 bases in mRNA?

1. How many possible codons can be formed from the 4 bases in mRNA?

2. What is the maximum number of codons that codes for one amino acid?

gundem   2035   2 Replies

gundem

1. The onset of labour is partly due to decreased levels of:

1. The onset of labour is partly due to decreased levels of:

a) progesterone
b) luteinizing hormone
c) estrogen
d. Folicle stimulating hormone

2.Decribe the formation of the plancenta and explain its main functions

i.luv.ed   7343   4 Replies

bio_man

1.What would happen to the blood sugar of someone who does not produce enough...

1.What would happen to the blood sugar of someone who does not produce enough...

1.What would happen to the blood sugar of someone who does not produce enough glucagon and someone who has a healthy pancreas?

2. What components (water, urea, glucose, protein, etc) would be found in: blood plasma, glomeralus filtrate, an

gundem   1208   2 Replies

bio_man

2 ap biology multiple choice help needed?

2 ap biology multiple choice help needed?

A component of the body?s second line of defense does not include

 
   cell-mediated apoptosis  
 an inflammatory response to recent injury
 phagocytes ingesting invading organisms
 anti-microbial activity due to lysozyme excreted in tears  
 
Vi

rk90   841   N/A

rk90

3 types of RNA help fast plz

3 types of RNA help fast plz

Please help fast, test tommorow:(

What are the 3 types of RNA?

tRNA

rRNA

mRNA

right? But what are their structures and functions (COMPARE THEM PLEASE AND TY ALOT!) I need this done really fast

hellohi   710   1 Reply

bio_man

? ? What is the difference between sex linked genes and linked genes? ? ? Ap biology?

? ? What is the difference between sex linked genes and linked genes? ? ? Ap biology?

sex-lined genes are on the x or y chromosomes, but what are linked genes???

help appreciated

rixter119   1536   1 Reply

mike279766

??

??

Parathyroid hormone (PTH) has a significant role in calcium homeostasis in humans. A rise in PTH levels stimulates all the following except
   
A,the deposition of calcium into bones and teeth making them strong and healthy

   

KONJO369   359   2 Replies

HJG

A 0.5-kg blob of clay moving at 2.0 m/s slams into a 4.0-kg blob of clay at rest. The speed of the ...

A 0.5-kg blob of clay moving at 2.0 m/s slams into a 4.0-kg blob of clay at rest. The speed of the ...

A 0.5-kg blob of clay moving at 2.0 m/s slams into a 4.0-kg blob of clay at rest. The speed of the two blobs stuck together after colliding is about
A) 1.1 m/s.
B) 1.5 m/s.
C) 2.5 m/s.
D) none of the above

Jeslinn   62   2 Replies

Jeslinn

A 0.600 m long pendulum is used to determine the acceleration due to gravity on

A 0.600 m long pendulum is used to determine the acceleration due to gravity on

A 0.600 m long pendulum is used to determine the acceleration due to gravity on a distant planet.  If 20 complete oscillations are completed in 35.5 s, the acceleration would be...

biochicka   7979   2 Replies

biochicka

A 1-kg ball dropped from a height of 2 m rebounds only 1.5 m after hitting the ground. The amount of ...

A 1-kg ball dropped from a height of 2 m rebounds only 1.5 m after hitting the ground. The amount of ...

A 1-kg ball dropped from a height of 2 m rebounds only 1.5 m after hitting the ground. The amount of energy converted to heat is about
A) 0.5 J.
B) 1.0 J.
C) 1.5 J.
D) 2.0 J.
E) more than 2.0 J.

bosoxsilva   82   2 Replies

bosoxsilva

A 1-kg ball is thrown straight up at 10 m/s. Neglecting air resistance, the net force that acts on ...

A 1-kg ball is thrown straight up at 10 m/s. Neglecting air resistance, the net force that acts on ...

A 1-kg ball is thrown straight up at 10 m/s. Neglecting air resistance, the net force that acts on the ball when it is halfway to the top of its path is
A) 1/2 N.
B) 1 N.
C) 5 N.
D) 7.5 N.
E) 10 N.

gabbywabbi   98   1 Reply

kristinwilliams

A 1-kg block of iron weighs about

A 1-kg block of iron weighs about

A 1-kg block of iron weighs about
A) 1 N.
B) 5 N.
C) 10 N.
D) more than 10 N.

nana123   35   2 Replies

nana123

A 1-N-falling apple hits the ground with a force of

A 1-N-falling apple hits the ground with a force of

A 1-N-falling apple hits the ground with a force of
A) 1 N.
B) 2 N.
C) 4 N.
D) 10 N.
E) not enough information

beunique123!   40   3 Replies

bobyjaw

A 10-kg block is pushed across a friction-free horizontal surface with a horizontal force of 20 N. ...

A 10-kg block is pushed across a friction-free horizontal surface with a horizontal force of 20 N. ...

A 10-kg block is pushed across a friction-free horizontal surface with a horizontal force of 20 N. The acceleration of the block is
A) 1 m/s2.
B) 2 m/s2.
C) 5 m/s2.
D) 10 m/s2.
E) none of the above

maximus5   72   2 Replies

maximus5

A 10-kg mass at Earth's surface weighs about

A 10-kg mass at Earth's surface weighs about

A 10-kg mass at Earth's surface weighs about
A) 1 N.
B) 5 N.
C) 10 N.
D) 100 N.
E) 1000 N.

dont Panic   52   2 Replies

dont Panic