The stage of development that involves cell division without cell growth is
A. Fertilization
B. Cleavage
C. Neurulation
D. Gastrulation
E. Organogenesis
B. Cleavage
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A human blastocyst normally implants in _____
a. an oviduct c. the uterus b. a seminferous tubule d. the vagina
Which of the following conditions is a sex-influenced trait?
a. pattern baldness b. incontinentia pigmenti c. ectoderm pigmentation syndrome d. epithelial aggregate syndrome e. albinism
Chloride ions passively follow sodium that has been actively transported out of tubular cells, due to the attraction of negatively charged ions to positively charged ions
Indicate whether the statement is true or false
In a wild-type strain of fruit flies, the length of a gene from the start to the stop codon is 2,000 DNA bases. Suppose an experiment indicated that the mRNA molecule transcribed from this gene is much shorter (only 1,200 bases)
What is the most likely explanation for this? A) There are introns in the DNA that were cut out of the mRNA. B) The mRNA was prematurely degraded. C) A mutation caused the formation of an extra stop codon in the gene. D) The first 800 bases of DNA are always cut out as it is transcribed into mRNA.