During a human pregnancy, implantation occurs at which stage?
a. zygote
b. early cleavage
c. blastocyst
d. gastrula
e. embryo
ANSWER: c
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A plant seedling bends toward sunlight because _____
A) auxin migrates to the lower part of the stem due to gravity B) there is more auxin on the light side of the stem C) auxin is destroyed more quickly on the dark side of the stem D) auxin is found in greatest abundance on the dark side of the stem E) gibberellins produced at the stem tip cause phototropism
The floating leaf disk assay measures oxygen production as an indication of photosynthetic activity. What other substances could be measured as alternate ways of measuring photosynthesis?
What will be an ideal response?
The lac operon
A. is an example of negative control. B. is affected by catabolite repression. C. produces lactose. D. is an example of a regulon. E. is an example of negative control AND is affected by catabolite repression.
____ is the study of body plans and structures
among groups of organisms. a. Embryology b. Molecular archeology c. Evolution d. Comparative morphology e. Composition