Gastrulation producesa(n) ____

a. hollow balls of cells
b. embryo with germ layers
c. solid balls of cells
d. haploid cells
e. yolk sac


ANSWER: b

Biology & Microbiology

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Over evolutionary time, photosynthesis has effectively poisoned itself by producing an oxygenic atmosphere because __________

A. rubisco is an oxygenase B. rubisco is a carboxylase C. O2 is a strong oxidant D. rubisco is an oxygenase and O2 is a strong oxidant E. rubisco is an oxygenase and O2 is a strong reductant

Biology & Microbiology

What is the key concept addressed by the question?

What will be an ideal response?

Biology & Microbiology

Give two examples of nonrandom mating.

What will be an ideal response?

Biology & Microbiology

What term would be applied to a regulatory condition that occurs when a protein is associated with a particular section of DNA and greatly reduces transcription?

A) positive control B) induction C) activation D) stimulation E) negative control

Biology & Microbiology