Cell Biology Answers

As the cell size increases what will happen ?

why are onion root tip (meristematic) cells especially useful for observing the phases of mitosis?

in your own words explain how studies of cell growth regulation may benefit cancer research. be as specific as possible (aim for approximately a half-page of text)

Herbicides like 2,4-D and 2,4,5-T stimulate cell division. How might this fact explain why these chemicals are effective as herbicides?

how many chromosomes would be expected in each new daughter cell if the mother cell has 10 chromosomes?

what do you think would happen if both sister chromatids of one cell move to the same pole during mitosis?

Number of cells in pahiten:

a. 2nII

b. 2nI

c. nI

d. nII

e. 2n

1) Illustrate a full schematic diagram of photosynthesis which must include the light-dependent and light-independent reactions. On that same illustration, point out (where) and briefly explain (when/how) on each of the process listed below could occur:

(i) Reshuffling of glyceraldehyde-3-phosphate

(ii) Pumping of H⁺ across membrane

(iii) Reduction of NADP⁺

(iv) Replenishment of electron on the photosystem

(v) Formation of 2-phosphoglycolate

How are neurons similar to other cells? How are they unique?

If the amount of DNA in a cell at G1 of the cell is 10 picograms (pg); what will the amount of DNA in that cell be at G2 phase of the cell cycle? Explain why?

Match each of the following molecules involved in cell communication with the function that best describes it.

1. G protein-coupled receptor
2. Receptor tyrosine kinase
3. Ligand-gated ion channel
4. Protein kinase
5. Cyclic AMP
6. Adenylyl cyclase
7. Hormone
8. Neurotransmitter

A) Protein which removes phosphates from proteins in a process called dephosphorylation

B) One of the most widely used second messengers

C) Molecule involved in long-distance signaling in plants and animals

D) Protein acts as an on/off switch: if GDP is bound to the protein, the protein is inactive.

E) Protein which converts ATP to cAMP in response to an extracellular signal

F) A messenger molecule that travels only short distances

G) This protein can trigger multiple signal transduction pathways at once

H) Protein which transfers phosphates from ATP to protein in a process called phosphorylation

I) When a signal molecule binds to this receptor, it allows specific ions (such as Na⁺ and Ca²⁺) through a channel in the receptor.