× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
d
4
N
3
3
R
3
k
3
o
3
Z
3
j
3
s
3
d
3
J
3
1
3
Home Q & A Board Biology-Related Homework Help Cell Biology
New Topic  
bturner bturner
wrote...
Go to Answer
Posts: 572
Rep: 1 0
6 years ago
Carrier-mediated transport is necessary when
 
  A) diffusion will not allow adequate amounts of a substance to enter the cell.
  B) movement into the cell is against a concentration gradient.
  C) the level of nutrients in nature is very low.
  D) nutrient concentration is very low in the environment, is higher inside of the cell, or diffusion is not possible.


Bacteria stain as gram-positive or gram-negative because of differences in the cell
 
  A) wall.
  B) cytoplasm.
  C) nucleus.
  D) chromosome.


Nutrient transport requires energy because the nutrients must be transported into the cell against a concentration gradient. The energy required for nutrient transport is supplied by
 
  A) ATP.
  B) the proton motive force.
  C) phosphoenol pyruvate.
  D) ATP, the proton motive force, or phosphoenol pyruvate.


The morphology of a cell influences its
 
  A) motility.
  B) metabolism.
  C) surface-to-volume ratio.
  D) motility and surface-to-volume ratio


Bacteria with type IV pili
 
  A) possess tubular or stalk-like extensions of their cells.
  B) likely exhibit twitching motility.
  C) have capsules that promote dehydration.
  D) live in aquatic environments.
Read 80 times
2 Replies
Replies
Answer verified by a subject expert
ownyoashownyoash
wrote...
#1
Posts: 292
Rep: 2 0
6 years ago
Sign in or Sign up in seconds to unlock everything for free

Related Topics

bturner Author
wrote...
#2
6 years ago
Slightly Frowning Face Still concerned about the others, I hope you can take a look at them
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1542 People Browsing
 107 Signed Up Today
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 744
  
 315
  
 330
Your Opinion
Which industry do you think artificial intelligence (AI) will impact the most?
Votes: 484
Previous poll results: Where do you get your textbooks?