Which region of the frog blastula corresponds to the future dorsal side of the embryo?

A) morula
B) primitive streak
C) archenteron
D) gray crescent
E) blastocoel


Answer: D) gray crescent

Biology & Microbiology

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Of the following molecules, which would not be expected to be moved across a membrane by simple diffusion?

A) oxygen B) fatty acids C) water D) glucose E) dimethylurea

Biology & Microbiology

Which structure holds homologous chromosomes tightly together and supports them as they undergo recombination?

a. kinetochore b. centromere

c. microtubules d. spermatozoa e. synaptonemal complex

Biology & Microbiology

After mutations begin a cancer, other factors that influence whether the disease proceeds include

A) how old a person is and whether he or she smokes. B) whether a person has had cancer before and its location in the body. C) location of the cancerous cell in the tissue and how specialized the cell is. D) whether or not a person's relatives have cancer.

Biology & Microbiology

The significance of one new and one parental strand in each new DNA molecule would be that:

1.New strands are more susceptible to mutation. 2.DNA polymerase will only work on a parental strand. 3.Having an original strand is needed to prevent errors during the replication process. 4.Strands can only pair with existing strands.

Biology & Microbiology