An acronym that describes sequences of a protein-coding gene that specify the amino acid sequence is ________.
What will be an ideal response?
ORF
open reading frame
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L-lysine is an essential amino acid and must be supplied in the diet. By comparison, the stereoisomer D-lysine is not biologically active. Why can your body only utilize one form?
A. Since the L form and D form are enantiomers, they will bind together and inhibit utilization of the D form. B. Since the L form and D form are chiral molecules, they will bind together and inhibit utilization of the D form. C. Antibodies recognize the D form and destroy it before your body can use it for nutritional purposes. D. Enzymes can only recognize a single, specific stereoisomer.
The outer layer of the mammalian kidney is the ____, and the inner layer is the ____
A. cortex; medulla B. medulla; cortex C. nephron; medulla D. cortex; nephron E. nephron; renal pyramid
The second meiotic division is essentially a mitosis division except for the fact that the cell are?
A. Diploid B. Haploid C. Autosomal D. Polyploidy E. Somatic
This table shows the abundance of iridium in and near the K–T boundary layer. Depths are given as meters above or below the boundary layer. The iridium content of an average Earth rock is 0.4 parts per billion (ppb) of iridium. An average meteorite contains about 550 parts per billion of iridium. Which conclusion do these data best support?
1.the earth was struck by a large asteroid 65.5 million years ago
2.an asteriod collision caused a mass extinction that wiped out the dinosaurs
3.the K-T boundary indicates the beginning of an ice age
4.rates of evolution increased dramatically after the K-T boundary