________ aid in the assembly of some biomolecules
Fill in the blank with correct word.
Answer: Molecular chaperones
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Which statement about sperm entry is TRUE?
a. The fertilization cone formed by microvilli of the egg membrane contracts and draws the sperm inward. b. The egg phagocytizes the acrosome of the sperm so it can enter the cell.
c. The cilia on the egg membrane beat and sweep the sperm inside. d. The sperm releases calcium ions, which make the egg membrane permeable to its entry. e. The egg secretes bindin protein, which allows sperm penetration.
Amongst the chordates, which features are unique to the tunicates?
A. sexual reproduction and complete digestive system B. leathery outer covering and sessile adult stage C. sessile adult stage and aquatic lifestyle D. gill slits and bilateral symmetry E. leathery outer covering and an excurrent siphon
Which of the following occur during initiation?
A. A tRNA containing the methionine codon and a ribosomal unit converge on an mRNA. B. A tRNA containing a UAA sequence hybridizes to a complementary mRNA sequence. C. Peptide bonds form between an amino acid and mRNA. D. Peptide bonds from between a tRNA an mRNA E. A tRNA containing a lysine codon attaches to an mRNA.
The kidneys are both protected and held in place by cushions of fat. In cases of rapid weight loss, the kidneys may drop to a lower position, possibly causing kinks in a nearby tubular organ. If this happens, urine will back up into the kidneys, severely damaging them. What organ(s) is/are most likely kinked in this situation?
A. Urethra B. Renal veins C. Ureters D. Renal arteries E. Nephrons