What does the synthetic theory of evolution emphasize?
a. population genetics
b. differential reproduction
c. overproduction of individuals
d. natural selection of individuals
e. homologous versus vestigial structures
a
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The comet exploring Rosetta spacecraft, Philae, reports back the presence of single-celled organisms that resemble bacteria found on the comet C-G. A module from the spacecraft containing a sample of the organism is rocketed back to earth
Amazingly, the comet organism can be grown in the lab. It is determined that DNA and RNA and proteins arepresent in the comet organism, but that four of the nitrogenous bases are different from terrestrial nucleotides. The comet organism's nitrogenous bases are named A, B, C, and D. Comet organism proteinswere found to contain only the 20 amino acids regularly found as components of terrestrial proteins. You are askedto decipher the genetic code of this comet organism. You synthesize three polyribonucleotides consisting of various combinations of A, B, and Cnitrogenous bases,and determine the amino acid sequence of any proteins synthesizedduring comet-organism cell-free in vitro translation. The results are shown in the table below: Polynucleotide sequence Amino acid sequence of polypeptide(s) 5' BCBCBCBCBCBC….. 3' …..GLY-ILE-GLY-ILE-GLY-ILE….. 5' BBCBBCBBCBBC….. 3 ' …..GLY-GLY-GLY-GLY-GLY….. …..ASN- ASN- ASN- ASN- ASN….. …..TYR-TYR-TYR-TYR-TYR….. 5'ABBCABBCABBCABBC….. 3' …..LYS-THR-VAL-TYR-LYS-THR-VAL-TYR….. If the genetic code of the comet organism is a triplet, nonoverlapping code with no commas, what is the codon for asparagine? A. BBC B. BCB C. CBB D. BBB
Researchers once believed that mammals were born with all of the neurons they would ever have. Recent research has proven this to be untrue. Approximately how many new neurons develop in the mammalian hippocampus daily?
a. 10 b. 100 c. 1,000 d. 10,000
Why do we have storage macromolecules, such as fats, in our bodies?
A. Macromolecules, such as fats, are a convenient way to store kinetic energy. B. We can break down these macromolecules to provide energy for the endergonic reactions in our bodies. C. Breaking down macromolecules, such as fats, is an endergonic process. D. Human cells can directly capture the energy of sunlight through photosynthesis and store it as macromolecules such as fats.
One way to regulate gene expression is through the production of different sigma factors. These cause RNA polymerase to bind to different sets of promoters, thereby altering the pattern of gene expression.
Answer the following statement true (T) or false (F)