The implanted blastula prevents ________ by secreting the hormone ________
a. menstruation, HCG
b. gastrulation, HCG
c. cleavage, progesterone
d. menstruation, progesterone
e. menstruation, estrogen
a
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What is the p value from this test? (Pick the most accurate choice.)
In Drosophila, singed bristles (sn) and carnation eyes (car) are both caused by recessive X-linked alleles. The wild-type alleles (sn+ and car+) are responsible for straight bristles and red eyes, respectively. A sn car female is mated to a sn+car+ male and the F1 progeny are interbred. The F2 are distributed as follows:
A) p> 0.5
B) 0.1
D) p< 0.05
E) p< 0.01
The neurotransmitter, __________, is used by motor neurons to communicate with muscle cells.
A. acetylcholine B. GABA C. glutamine D. fatty acids E. serotonin
Which of the following statements is incorrect?
A) Enzymes raise the activation energy of a reaction. B) Enzymes speed up the rate of a reaction. C) Substrates bind to an enzyme's active site. D) Enzymes change shape when they bind to a substrate.
Cuticle (and/or cork) is found on the surfaces of all of the following except:
A. Leaves B. Green stems C. Woody roots D. Root hairs E. Woody stems