An embryo with meroblastic cleavage, extraembryonic membranes, and a primitive streak must be that of _____
A) an insect
B) an amphibian
C) a bird
D) a sea urchin
C
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Which cells are located in the brain and spinal cord of vertebrates?
a. interneurons b. motor neurons c. afferent neurons d. efferent neurons e. afferent and efferent neurons
Annotation is a process done to find all genes that
A. code for protein. B. are active in any given cell type. C. encode any RNA or protein product. D. are linked on any one chromosome. E. exist in a species.
A vaccine works by ________
A) inhibiting bacterial reproduction B) stimulating the immune system to develop lasting defenses C) killing cells infected with a virus D) preventing translation of mRNA molecules that code for disease-causing proteins
The exchange of genetic material during crossing over causes which of the following?
A) homozygosity B) genetic variation C) heterozygosity D) stasis