Bio Hard Kognity Questions

If a DNA sample were composed of 10% thymine, what would be the percentage of guanine?

40

A particular triplet of bases in the template strand of DNA is AGT. The corresponding codon for the mRNA transcribed is:

UCA

When a farmer begins to plant more genetically modified crops (GMOs) with increased tolerance to pesticides, which of the following is a possible result? #1 An increase in the pesticide resistance in the insect population #2 A decrease in genetic diversity of the crops #3 An increase in the contamination of the water supply #4 A decrease in crop productivity in these fields

#1 An increase in the pesticide resistance in the insect population

According to the theory of punctuated equilibrium, #1 a new species accumulates most of its unique features as it comes into existence. #2 natural selection is unimportant as a mechanism of evolution. #3 Your choice given enough time, most existing species will branch gradually into new species. #4 transitional fossils, intermediate between newer species and their parent species, should be abundant.

#1 a new species accumulates most of its unique features as it comes into existence.

Speciation: #1 Occurs at such a slow pace that no one has ever observed the emergence of new species. #2 Your choice Occurs only by the accumulation of genetic change over vast expanses of time. #3 Can occur through polyploidy. #4 Occurs only through environmental change.

#3 Can occur through polyploidy.

For a species with a haploid number of 12 chromosomes, how many different combinations of maternal and paternal chromosomes are possible for the gametes?

4096 Explanation: ​The number of possible combinations is equal to 2 to the power of the number of haploid chromosomes, so in this case 212 = 4096.

The base ratios in the DNA and RNA for an onion (Allium cepa) are given below. Bases A / % G / % C / % T / % DNA 31.8 18.4 18.2 31.3 Bases A / % G / % C / % U / % RNA 24.9 29.8 24.7 20.6 What is the reason for the difference between these figures? #1 DNA is made entirely of double helix but RNA is not. #2 DNA is only found in the nucleus but RNA is found throughout the cell. #3 In DNA bases A and T are complementary but in RNA bases A and C are complementary. #4 RNA comes in three forms but DNA only comes in one form.

DNA is made entirely of double helix but RNA is not.

A tRNA molecule with anticodon CAG carries the amino acid phenylalanine. Which codon of mRNA will the tRNA join? #1 CTG #2 CAG #3 GTC #4 GUC

GUC

In the experiments performed by Meselson and Stahl, E. coli were grown for many generations in a medium containing 15N, then for one generation in 14N. What results for the DNA of the last generation showed that replication was semi-conservative?

One strand containing only 15N and one strand containing only 14N.