Which excretory organs are found in insects?
A. nephridia
B. protonephridia
C. Malpighian tubules
D. nephron
Answer: C
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Which is the closest living nonvascular relative to vascular plants?
a. hornworts b. liverworts c. mosses d. ferns e. red algae
What are two commonly used DNA landmarks for mapping human genes?
What will be an ideal response?
What occurs during gastrulation?
A) A solid embryo is changed into a hollow morula. B) A solid blastula is changed into a hollow embryo that has four tissue layers. C) A hollow blastula is changed into a hollow embryo that has three tissue layers. D) A neural tube is created by invagination of the ectoderm.
A and a are dominant and recessive alleles, respectively, of the same gene. Which genotype(s) would result in an individual with the recessive phenotype?
A) aa only B) Aa only C) AA only D) Aa and aa E) AA and aa