The inner cell mass of the blastocyst develops into the ____
a. amnion
b. zygote
c. embryo
d. yolk sac
e. placenta
ANSWER: c
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True or false: All 64 possible triplet sequences in an mRNA are recognized by a nucleic acid molecule
A. true B. false
Mendel kept detailed records of the genetic traits of parent plants and their offspring plants. Among observations, he found that some traits were not expressed, whenever one particular allele was present. He referred to these traits as masked traits, or
A. recessive traits. B. heterozygous traits. C. homologous traits. D. dominant traits. E. homozygous traits.
The male part of a flower is the
a. carpel. b. stamen. c. petal. d. sepal. e. receptacle.
In which organ does the smooth ER inactivate drugs and harmful metabolic byproducts?
a. brain b. kidney c. liver d. heart e. spleen