General Biology

The main function of the AV node is to

The main function of the AV node is to

The main function of the AV node is to
A) initiate the heartbeat.
B) set the rhythm of the heartbeat.
C) relay the signal for the heart to contract from the right ventricle to the right atrium.
D) relay a signal for the ventricles to contract.

AkuAku   19   1 Reply

Guest

What moves the human egg through the oviduct?

What moves the human egg through the oviduct?

What moves the human egg through the oviduct?
A) the beating of the egg's cilia
B) rhythmic contractions of the oviduct
C) rhythmic contractions of the uterus
D) the beating of cilia in the oviduct

jonathanvsjkgof   19   3 Replies

joelatino

Which of the following is part of the brain?

Which of the following is part of the brain?

Which of the following is part of the brain?
A) thymus
B) hypothalamus
C) adrenal cortex
D) thyroid

Ace_AZ   19   2 Replies

Ace_AZ

Which of the following cells would be active during an immune response to a viral infection?

Which of the following cells would be active during an immune response to a viral infection?

Which of the following cells would be active during an immune response to a viral infection?
A) natural killer cells, only
B) phagocytic cells, only
C) T cells, only
D) all of these cell types

gabbywabbi   19   1 Reply

LindseyE123

A heart murmur occurs when there is a defect in ________.

A heart murmur occurs when there is a defect in ________.

A heart murmur occurs when there is a defect in ________.
A) a heart valve
B) the sinoatrial node
C) arterioles
D) the timing of the cardiac cycle

hkk   19   2 Replies

hkk

Which of these is most closely associated with Darwin?

Which of these is most closely associated with Darwin?

Which of these is most closely associated with Darwin?
A) energy flow
B) ecosystem structure
C) the three domains of life
D) natural selection

samualson   19   2 Replies

samualson

More than half of all known species are ________.

More than half of all known species are ________.

More than half of all known species are ________.
A) plants
B) insects
C) bacteria
D) vertebrates

samualson   19   3 Replies

guzman

RNA is believed to have evolved before DNA and proteins.

RNA is believed to have evolved before DNA and proteins.

RNA is believed to have evolved before DNA and proteins.
[True or False]

shimaa farouk   19   2 Replies

shimaa farouk

Labor is triggered when which one of the following fetal organs or systems is mature?

Labor is triggered when which one of the following fetal organs or systems is mature?

Labor is triggered when which one of the following fetal organs or systems is mature?
A) pituitary gland
B) digestive system
C) heart
D) lungs
E) adrenal gland

mzeplin   19   2 Replies

mzeplin

The rapid development of knowledge regarding how to manipulate and analyze DNA, including techniques ...

The rapid development of knowledge regarding how to manipulate and analyze DNA, including techniques ...

The rapid development of knowledge regarding how to manipulate and analyze DNA, including techniques for modifying its structure, has led to the new field in biology known as
A) graphic display.
B) DNA splicing.
C) recombinant DNA technology.
D)

lanachase   19   1 Reply

iris

All of the following infectious microorganisms are thought to contribute to cancer EXCEPT which one?

All of the following infectious microorganisms are thought to contribute to cancer EXCEPT which one?

All of the following infectious microorganisms are thought to contribute to cancer EXCEPT which one?
A) E. coli
B) Epstein-Barr virus
C) human papillomavirus
D) Helicobacter pylori
E) hepatitis B virus

sorandomkay13   19   2 Replies

sorandomkay13

Explain the importance of checkpoints to the cell cycle.

Explain the importance of checkpoints to the cell cycle.

Explain the importance of checkpoints to the cell cycle.

maximus5   19   2 Replies

maximus5

All cells that make up the body other than germ cells are referred to as ________.

All cells that make up the body other than germ cells are referred to as ________.

All cells that make up the body other than germ cells are referred to as ________.

ejones3535   19   2 Replies

ejones3535

The symptoms of HPV can be treated, but there is no cure.

The symptoms of HPV can be treated, but there is no cure.

The symptoms of HPV can be treated, but there is no cure.
[True or False]

A1   19   2 Replies

A1

The human papilloma virus (HPV) causes

The human papilloma virus (HPV) causes

The human papilloma virus (HPV) causes
A) gonorrhea.
B) vaginal yeast infections.
C) genital herpes.
D) syphilis.
E) genital warts.

TheFulcan   19   2 Replies

TheFulcan

Prior to the onset of lactation, the mammary glands are prepared for the production of milk by

Prior to the onset of lactation, the mammary glands are prepared for the production of milk by

Prior to the onset of lactation, the mammary glands are prepared for the production of milk by
A) the hormonal action of estrogen and progesterone.
B) the completion of ovulation.
C) degeneration of the corpus luteum.
D) deactivation of FSH, LH,

malry187   19   2 Replies

malry187

Hormones act upon specific target tissues because

Hormones act upon specific target tissues because

Hormones act upon specific target tissues because
A) they interact only with target cells at a synapse.
B) they are released next to target tissues, so they cannot interact with other cells.
C) target tissues display the appropriate receptor for a

krishna2018   19   1 Reply

kdemond

A little girl was playing in the snow one day and found that she was wiping her nose quite often. ...

A little girl was playing in the snow one day and found that she was wiping her nose quite often. ...

A little girl was playing in the snow one day and found that she was wiping her nose quite often. The "runny nose" that she was experiencing due to the cold temperatures resulted from
A) an insufficient production of mucus.
B) an inadequate supply

monthers   19   2 Replies

monthers

The blood components in B include ________ and ________.

The blood components in B include ________ and ________.

The blood components in B include ________ and ________.

amandeep68   19   3 Replies

Sean Bird

The process of displaying and organizing data to represent connections is known as

The process of displaying and organizing data to represent connections is known as

The process of displaying and organizing data to represent connections is known as
A) algebra.
B) differential equations.
C) statistics.
D) graphing.
E) correlation and causation.

mik1104   19   2 Replies

mik1104

Sometimes an allele that has no phenotypic effect can spread through a population by means of

Sometimes an allele that has no phenotypic effect can spread through a population by means of

Sometimes an allele that has no phenotypic effect can spread through a population by means of
 
  a. a selective sweep
  b. genetic recombination
  c. disruptive selection
  d. frequency-dependent selection
  e. directi

Andrearcarter95   19   3 Replies

jhgfdsa

Live-bearing reproduction, or viviparity, has apparently evolved

Live-bearing reproduction, or viviparity, has apparently evolved

Live-bearing reproduction, or viviparity, has apparently evolved
 
  a. just three separate times.
  b. about 200 separate times in vertebrates alone.
  c. only in mammals.
  d. only once, although many groups lost it second

vicmillz   19   2 Replies

vicmillz

Why is the absence of bone in Chondrichthyes considered a derived trait? What will be an ideal ...

Why is the absence of bone in Chondrichthyes considered a derived trait? What will be an ideal ...

Why is the absence of bone in Chondrichthyes considered a derived trait?
 
  What will be an ideal response?

Question 2

Why do vertebrates have more individual Hox genes than most in

emmybay02   19   2 Replies

emmybay02

What percent of couples in the U.S. are infertile?

What percent of couples in the U.S. are infertile?

What percent of couples in the U.S. are infertile?
 
  a. 1-5
  b. 10-15
  c. 20-25
  d. 50-55
  e. 70-75

Question 2

The presence of ____ in urine indicates a preg

Carlina864   19   2 Replies

Carlina864

Write the letter of the terrestrial biome with the lowest mean precipitation next to 1. Sequence the ...

Write the letter of the terrestrial biome with the lowest mean precipitation next to 1. Sequence the ...

Write the letter of the terrestrial biome with the lowest mean precipitation next to 1. Sequence the
  remaining biomes by increasing precipitation, finishing by writing the letter of the biome with the
  highest mean precipitation next to

claudiawong05   19   2 Replies

claudiawong05

A keystone species has a greater effect on community structure than its numbers might suggest. ...

A keystone species has a greater effect on community structure than its numbers might suggest. ...

A keystone species has a greater effect on community structure than its numbers might suggest.
 
  Indicate whether the statement is true or false.

Question 2

During the 1960s ecol

Preet   19   2 Replies

Preet

Humans have disrupted the nitrogen cycle primarily by

Humans have disrupted the nitrogen cycle primarily by

Humans have disrupted the nitrogen cycle primarily by
 
  a. irrigation.
  b. cutting down forests.
  c. using nitrogen-containing fertilizers.
  d. crop rotation.
  e. leaching.

Maria   19   3 Replies

Same.sha

How does skeletal muscle contract? What will be an ideal ...

How does skeletal muscle contract? What will be an ideal ...

How does skeletal muscle contract?
 
  What will be an ideal response?

Question 2

How are some protists of commercial value?
 
  What will be an ideal response?

tpost99   19   2 Replies

tpost99

How does the changing state of ATP-binding on myosin influence sarcomere contraction? What will ...

How does the changing state of ATP-binding on myosin influence sarcomere contraction? What will ...

How does the changing state of ATP-binding on myosin influence sarcomere contraction?
 
  What will be an ideal response?

Question 2

Four of the five answers below possess vascular

krystian   19   2 Replies

krystian

What system reclaims fluids and proteins that have escaped from blood capillaries?

What system reclaims fluids and proteins that have escaped from blood capillaries?

What system reclaims fluids and proteins that have escaped from blood capillaries?
 
  a. cardiovascular
  b. pulmonary
  c. lymphatic
  d. sinoatrial
  e. venous

Question 2[

MapHarr   19   3 Replies

Rene

Distinguish between the types of meristems. What will be an ideal ...

Distinguish between the types of meristems. What will be an ideal ...

Distinguish between the types of meristems.
 
  What will be an ideal response?

Question 2

Characterize phloem.
 
  What will be an ideal response?

nmar   19   2 Replies

nmar

If one phosphate is removed from ATP, the remaining molecule would be _____________.

If one phosphate is removed from ATP, the remaining molecule would be _____________.

If one phosphate is removed from ATP, the remaining molecule would be _____________.
 
  a. adenosine triphosphate
  b. adenosine diphosphate
  c. adenosine monophosphate

Question 2

Rony02   19   1 Reply

hbirk8

How many proteins are present in the extract from the individual that is homozygous dominant?

How many proteins are present in the extract from the individual that is homozygous dominant?

How many proteins are present in the extract from the individual that is homozygous dominant?
 
  a. 5
  b. 6
  c. 7
  d. 8

Question 2

Although Lamarck's hypothesis

roltschj   19   3 Replies

noox

Of all the different codons that exist, three of them

Of all the different codons that exist, three of them

Of all the different codons that exist, three of
  them
 
  a. are not used in any organisms.
  b. do not code for an amino acid.
  c. code for non-functional amino acids.
  d. signify start here.
  e. do more than

nmar   19   1 Reply

Delorean

With which of the following chemicals do white blood cells communicate with each other?

With which of the following chemicals do white blood cells communicate with each other?

With which of the following chemicals do
  white blood cells communicate with each
  other?
 
  a. complement proteins
  b. cytokine
  c. hydrogen peroxide
  d. methicillin
  e. lysozyme

[color=#165F

BurningAshe   19   3 Replies

Dwilli904

The first vaccine created was for

The first vaccine created was for

The first vaccine created was for
 
  a. hepatitis B.
  b. influenza.
  c. small pox.
  d. cholera.
  e. diphtheria

Question 2

Passive immunization differs from

chrystalhdz   19   2 Replies

chrystalhdz

How does the wheat stem rust fungus harm its host plant?

How does the wheat stem rust fungus harm its host plant?

How does the wheat stem rust fungus harm its
  host plant?
 
  a. by blocking the flow of water through the
  plant
  b. it interferes with the photosynthetic process
  c. it absorbs plant sugars made in
  photosyn

Alexis23   19   1 Reply

macchamugicha

The seed plants became dominant in the late ___ when the climate became ___.

The seed plants became dominant in the late ___ when the climate became ___.

The seed plants became dominant in the late
  ___ when the climate became ___.
 
  a. Cambrian---wetter
  b. Carboniferous---drier
  c. Carboniferous--wetter
  d. Cretaceous---drier
  e. Cretaceous---wetter

mrs.anderson   19   2 Replies

mrs.anderson

. Four of the five answers listed below are grasses. Select the EXCEPTION.

. Four of the five answers listed below are grasses. Select the EXCEPTION.

. Four of the five answers listed below are
  grasses. Select the EXCEPTION.
 
  a. rye
  b. wheat
  c. rice
  d. lilies
  e. corn

Question 2

Four of the five

buttssss   19   2 Replies

buttssss

The discovery of which of the following allowed researchers to determine the sequences of ...

The discovery of which of the following allowed researchers to determine the sequences of ...

The discovery of which of the following
  allowed researchers to determine the sequences
  of nucleotides in DNA molecules?
 
  a. single-nucleotide polymorphisms
  b. restriction enzymes
  c. DNA assembly enzymes

littleroberts   19   2 Replies

littleroberts