Nucleoli contain many tandem repeat copies of which genes, transcribed by RNA polymerase I?
A) mRNA
B) tRNA
C) rRNA
D) siRNA
E) all of the above
C
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According to the fluid mosaic model of cell membranes, which of the following is true regarding
membrane phospholipids?
a. They are anchored in place by intermediate filaments. b. They can move laterally along the plane of the membrane. c. They have hydrophilic tails in the interior of the membrane. d. They occur in an uninterrupted bilayer, with membrane proteins bound only to the surface of the membrane. e. They are free to leave the membrane and dissolve in the interstitial fluid.
The __________ deliver oxygenated blood from the
lungs to the heart. a. pulmonary arteries b. brachial arteries c. femoral arteries d. pulmonary veins e. jugular veins
Which group does the supergroup Opisthokonta exclude?
A. Fungi B. Animals C. Nucleariids D. Amoebozoans E. Choanoflagellates
The sex of birds, some insects, and other organisms is determined by a ZW chromosomal arrangement in which the males have like sex chromosomes (ZZ) and females are ZW (similar to XY in humans). Assume that a recessive lethal allele on the Z chromosome
causes death of an embryo in birds. What sex ratio would result in the offspring if a cross were made between a male heterozygous for the lethal allele and a normal female? A) 4:1 male to female B) 3:1 male to female C) 2:1 male to female D) 1:1 male to female E) 1:2 male to female