Answer the following statements true (T) or false (F)

1. Plants are unable to use nitrogen gas directly.
2. Sunlight can actually be so intense that photosynthesis can be stopped.
3. Nitrogen is one of the most abundantly applied fertilizers worldwide.
4. When body temperature drops below normal, a person starts shivering uncontrollably. This is an example of negative feedback.


1. TRUE
2. TRUE
3. TRUE
4. TRUE

Biology & Microbiology

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Sieve plates:

A. are modified cell walls that connect sieve elements. B. do not contain plasmodesmata. C. dissolve at sieve tube maturity. D. have solid, impermeable surfaces. E. contain mitochondria and chloroplasts.

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In the cAMP pathway, the G protein activates ____

a. adenylyl cyclase b. diacylglycerol c. phospholipase C d. inositol triphosphate e. phosphodiesterase

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You have control over the ______ movements

Fill in the blank(s) with the appropriate word(s).

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Consider a population in which two alleles, A and B, with frequencies F(A) = a and F(B) = b, segregate at a sin-gle locus. Which of the following genotypic frequencies are expected in this population under a Har-dy–Weinberg equilibrium?

a. 2a(1-a) b. a(1-b) c. b2 d. All of the above e. None of the above

Biology & Microbiology