Which of the following is not a reason why two children born to the same parents [not identical twins] are unlikely to have the same genetic makeup?
A) Crossing over recombines portions of sister chromatids.
B) Fertilization provides a new pairing of chromosomes.
C) Each sperm or egg has a random assortment of chromosomes, half from each pair.
D) Chromosomes align themselves independently during meiosis I.
E) Since though they are produced at different times, all sperm will be genetically different from all other sperm.
Ans: E) Since though they are produced at different times, all sperm will be genetically different from all other sperm.
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Seeds appeared in the fossil record by
A. 100 million years ago. B. 365 million years ago. C. 545 million years ago. D. 780 million years ago. E. a billion years ago.
Which of the following is the primary site of nutrient absorption in the mammalian digestive system?
A. pharynx B. stomach C. small intestine D. large intestine E. pancreas
The type of RNA that carries out RNA interference is
A) tRNA. B) mRNA. C) rRNA. D) siRNA.
Which of the following is a membranous organelle that chemically modifies and ships proteins to other organelles or out of the cell?
A) lysosome B) chloroplast C) mitochondria D) Golgi complex