At which gestational age does a developing human fetus first look obviously human and not like other vertebrate embryos?
A) 2 weeks
B) 4 weeks
C) 9 weeks
D) 4 months
Answer: C
You might also like to view...
Sickle-cell anemia is a human disease that occurs as a result of what type of mutation in the b-globin gene?
A. silent B. missense C. nonsense D. frameshift E. sense
Whole genome or shotgun sequencing requires
A) the creation of a cDNA library. B) the creation of overlapping DNA fragments whose sequences can be aligned into large contiguous fragments (contigs) using computer algorithms. C) large contiguous fragments (contigs) cloned into yeast artificial chromosomes (YACs) in an ordered fashion. D) very large amounts of DNA from the organism whose genome is being sequenced. E) the use of a gene gun to propel DNA-coated particles at high velocities into cells.
Inside the corolla is a whorl of ____, the organs that produce male gametophytes.
A. sepals B. petals C. carpels D. ovaries E. stamens
At the end of the electron transport chain in cellular respiration, what molecule is the final electron acceptor?
a. carbon dioxide b. glucose c. hydrogen d. oxygen