ehd123

Positive and Negative Tropism

Positive and Negative Tropism

Explain the difference between positive and negative tropism. Give one example of each.

ppk   7468   1 Reply

duddy

Absorption rate of proteins in carnivores?

Absorption rate of proteins in carnivores?

In order to solve a problem, I need to know some typical value of the absorption rate of proteins (amino acids) in carnivores. Can you give some typical value for this? If the answer is in nmom min-1 cm-2, then good. But other units will also do. Jus

visharad   1755   1 Reply

bio_man

Finding if cellulase activity is intrinsic or symbiotic

Finding if cellulase activity is intrinsic or symbiotic

Can you suggest some simple experiment to determine if the cellulase activity in an animal is intrinsic or is symbiotic in origin?

I thought of this experiment but am not sure:-
Maintain temperature and pressure at which s

visharad   3257   3 Replies

duddy

Sparrows

Sparrows

White-crowned sparrows in Alaska and Washington State sing different dialects. With the white-crowned and golden-crowned sparrows, we have two closely related birds whose ranges overlap. If the songs of the birds evolved to prevent interspecific mati

Kelly185891   1105   2 Replies

bio_man

If plants capture light energy and convert it to chemical energy stored in sugar and other molecules

If plants capture light energy and convert it to chemical energy stored in sugar and other molecules

If plants capture light energy and convert it to chemical energy stored in sugar and other molecules. If this was correct, then wouldn't all plants taste sugary and sweet? spinach and lettuce doesn't taste sweet. Most veggies don't or

oldcollegelady   1704   3 Replies

bio_man

Hestiate Cat Adoption (What do I do?)

Hestiate Cat Adoption (What do I do?)

I was wondering, someday I hope to get a kitten. If I raise that kitten around my two dogs and it doesn't fear them will the cat not fear other dogs? Also if you have two dogs and a fully grown cat and you seenthe dogs hate the cat and bark at i

Kelly185891   1119   1 Reply

duddy

Animal Behavior: Choosing Where to Live

Animal Behavior: Choosing Where to Live

In one study of brown bears (grizzlies) in Sweden, 15 of 16 males left their mothers and natal territories behind while only 13-32 females dispersed. Older and heavier females were less likely to be part of the dispersing cohort. So here, as in Beldi

Kelly185891   2643   1 Reply

bio_man

Cry Baby!

Cry Baby!

Birds are not the only animals in which offspring have special signals that appear to communicate need to a parent.  After reading the section of Chapter 9 Why Do Baby Birds Beg So Loudly?, develop an evolutionary analysis of crying

Kelly185891   1858   1 Reply

bio_man

Sexual Animal Behavior

Sexual Animal Behavior

In their classic paper on mating systems. (Emlen S & Oring L. Ecology, sexual selection, and the evolution of mating systems. Science 197:215-23, 1977), Steve Emlen and Lew Oring suggested that two ecological factors could promote the evolution o

Kelly185891   2128   1 Reply

bio_man

Siblicide: Hyenas

Siblicide: Hyenas

For a mammalian example, spotted hyena females often give birth to twins, and the pups complete aggresively for their mother's milk. The battles between pups sometimes leads to the death of one of the twins. Test the proposition that these cases

Kelly185891   2479   2 Replies

lewis

Etiolated Seedlings

Etiolated Seedlings

What are etiolated seedlings trying to do, and what does a red light flash do to the etiolated
seedling?

Thanks

Octoshark   2026   2 Replies

ThePsychic

Chromophore of Phytochrome

Chromophore of Phytochrome

How does the chromophore’s shape change after absorption of
light and what does this do the phytochrome protein to allow for a different function?

Thank you!

Octoshark   1767   1 Reply

bio_man

Plants Diversity II

Plants Diversity II

1. In lower plants, the spore is the only protective stage in the plant cycle. Why do seed plants have an advantage over spore-producing plants.

2. What are the main differences between gymnosperms and angiosperms?

3

Ashmo   3085   1 Reply

bio_man

Grass/Weed

Grass/Weed

Hello again sirs/madams! Who can help me in showing or explaining the parts of a grass/weed?

minissa   1451   5 Replies

duddy

Dicots and Monocots

Dicots and Monocots

what's the difference between these two? examples please thnks

pumpkinbread   1437   1 Reply

pumpkinbread

The reduction of nitrates and nitrites to ammonia is considered an extension of photosynthesis...

The reduction of nitrates and nitrites to ammonia is considered an extension of photosynthesis...

Hi all!

I have a few questions that I am not sure of what the answers are!  I have tried to figure them out on my own and have answers to most if not all.  i just want to double check myself!! Please help me!!

1.) The

Hokiepokieful   1728   1 Reply

bio_man

Plant Bio Questions - Double Check!

Plant Bio Questions - Double Check!

Sorry this is a long list!
I've answered most of them, I just want to double check!

The A-, B-, and C-class gene encode proteins that function as:
   1. Promoter Regions
   2. Receptors
   3. Transcr

Hokiepokieful   1595   2 Replies

Hokiepokiefully

The A-, B-, and C-class gene encode proteins that function as:

The A-, B-, and C-class gene encode proteins that function as:

One last question:

The A-, B-, and C-class gene encode proteins that function as:
   a. Promoter Regions
   b. Receptors
   c. Transcription Factors
   d. Hormones

I can't for the lif

Hokiepokieful   960   1 Reply

bio_man

Onion cell walls and red nuetral

Onion cell walls and red nuetral

Hi,

What feature in onion cell walls is it that makes red neutral color (stain) them? Is the staining equal; is everywhere of the cell and the vacuoles colored equally? If not, why?

Thanks.

mafhh   1628   1 Reply

bio_man

Several Plant Questions

Several Plant Questions

 

1. Which of the following describes ethylene response mutants identified without using any hormones in the triple response mutant screen?   
a.   Hormone insensitive mutant
b.   Hormone receptor mutant
c.   Ho

Hokiepokieful   2230   2 Replies

duddy

Plants

Plants

How do plants live on land?

TGLM   1477   3 Replies

lewis

Most of the growth of a plant body is the result of

Most of the growth of a plant body is the result of

Most of the growth of a plant body is the result of   
A) morphogenesis.
B) cell differentiation.
C) cell division.
D) reproduction.
E) cell elongation.

ppk   4230   1 Reply

bio_man

The phase change of an apical meristem from the juvenile to the mature vegetativ

The phase change of an apical meristem from the juvenile to the mature vegetativ

The phase change of an apical meristem from the juvenile to the mature vegetative phase is often revealed by     

A) the initiation of secondary growth.
B) the formation of lateral roots.
C) the activation of floral mer

ppk   1869   1 Reply

bio_man

The innermost layer of the root cortex is the

The innermost layer of the root cortex is the

The innermost layer of the root cortex is the   
A) pericycle.
B) core.
C) endodermis.
D) vascular cambium.
E) pith.

ppk   4078   1 Reply

bio_man

Suppose George Washington completely removed the bark from around the base of a

Suppose George Washington completely removed the bark from around the base of a

Suppose George Washington completely removed the bark from around the base of a cherry tree but was stopped by his father before cutting the tree down. The leaves retained their normal appearance for several weeks, but the tree eventually died. The t

ppk   2329   1 Reply

bio_man

As a youngster, you drive a nail in the trunk of a young tree that is 3 meters t

As a youngster, you drive a nail in the trunk of a young tree that is 3 meters t

As a youngster, you drive a nail in the trunk of a young tree that is 3 meters tall. The nail is about 1.5 meters from the ground. Fifteen years later, you return and discover that the tree has grown to a height of 30 meters. About how many meters ab

ppk   2135   1 Reply

bio_man

A monocot stem is represented by

A monocot stem is represented by

A monocot stem is represented by
A) I only.
B) II only.
C) III only.
D) IV only.
E) both I and III.

ppk   3050   1 Reply

lena213

A woody eudicot is represented by

A woody eudicot is represented by

A woody eudicot is represented by     
A) I only.
B) II only.
C) III only.
D) IV only.
E) both I and III

ppk   2901   1 Reply

lena213

Heartwood and sapwood consist of

Heartwood and sapwood consist of

Heartwood and sapwood consist of   
A) secondary xylem.
B) bark.
C) cork.
D) periderm.
E) secondary phloem

ppk   7803   1 Reply

lena213

A plant that is at least 3 years old is represented by

A plant that is at least 3 years old is represented by

A plant that is at least 3 years old is represented by     
A) I only.
B) II only.
C) III only.
D) IV only.
E) both I and III.

ppk   2992   1 Reply

lena213

Which of the following are true statements about the cells shown in the photogra

Which of the following are true statements about the cells shown in the photogra

Which of the following are true statements about the cells shown in the photograph in Figure 35.1 above?   
A) They are parenchyma cells.
B) They are photosynthetic.
C) They are parenchyma cells and photosynthetic.
D) They ar

ppk   3716   1 Reply

lena213

Which of the following arise, directly or indirectly, from meristematic activit

Which of the following arise, directly or indirectly, from meristematic activit

 Which of the following arise, directly or indirectly, from meristematic activity?     
A) dermal tissue
B) secondary xylem, leaves, dermal tissue, and tubers
C) tubers
D) leaves
E) secondary xylem

ppk   3707   1 Reply

lena213

The polarity of a plant is established when

The polarity of a plant is established when

 The polarity of a plant is established when   
A) cotyledons form at the shoot end of the embryo.
B) the shoot first breaks through the soil into the light as the seed germinates.
C) the shoot-root axis is established in the embr

ppk   2909   1 Reply

lena213

What tissue makes up most of the wood of a tree?

What tissue makes up most of the wood of a tree?

What tissue makes up most of the wood of a tree?     
A) secondary xylem
B) mesophyll cells
C) secondary phloem
D) primary xylem
E) vascular cambium

ppk   4312   1 Reply

lena213

Before differentiation can begin during the processes of plant cell and tissue c

Before differentiation can begin during the processes of plant cell and tissue c

Before differentiation can begin during the processes of plant cell and tissue culture, parenchyma cells from the source tissue must 
A) enzymatically digest their primary cell walls.
B) undergo dedifferentiation.
C) establish a

ppk   1962   1 Reply

lena213

A mutation allows only A gene activity in a developing flower. Which flower part

A mutation allows only A gene activity in a developing flower. Which flower part

 A mutation allows only A gene activity in a developing flower. Which flower part(s) will develop in this plant?     

A) both sepals and petals
B) petals
C) carpels
D) sepals
E) stamens

ppk   1948   1 Reply

lena213

A plant has the following characteristics: a taproot system, several growth ring

A plant has the following characteristics: a taproot system, several growth ring

A plant has the following characteristics: a taproot system, several growth rings evident in a cross section of the stem, and a layer of bark around the outside. Which of the following best describes the plant?     

A) herb

ppk   4482   1 Reply

lena213

What effect does "pinching back" have on a houseplant?

What effect does "pinching back" have on a houseplant?

 What effect does "pinching back" have on a houseplant?     
A) produces a plant that will grow taller
B) increases apical dominance
C) increases the flow of auxin down the shoot
D) stimulates lateral buds to g

ppk   2249   1 Reply

lena213

If you were able to walk into an opening cut into the center of a large redwood

If you were able to walk into an opening cut into the center of a large redwood

If you were able to walk into an opening cut into the center of a large redwood tree, when you exit from the middle of the trunk (stem) outward, you would cross, in order,     

A) the vascular cambium, oldest xylem, and new

ppk   2851   1 Reply

lena213

What would be a plant adaptation that increases exposure of a plant to light in

What would be a plant adaptation that increases exposure of a plant to light in

What would be a plant adaptation that increases exposure of a plant to light in a dense forest?     
A) lateral buds
B) intercalary meristems
C) apical dominance
D) absence of petioles
E) closing of the stomata

ppk   3376   1 Reply

lena213