BLY 121 Quiz 5

At the cellular level, which of the following molecules is considered our primary energy "currency"? -DNA -RNA -ATP -protein

ATP

Which is the most accurate summary equation for photosynthesis?

CO2 + H2O + light energy ----> C6H12O6 + O2 + H2O

You isolate a single nucleotide from a nucleic acid chain and determine that the nitrogenous ring structure is that of thymine. Without knowing anything else about this nucleotide, you could say with certainty that the nucleotide came from: -either DNA or RNA -RNA but not DNA -neither DNA or RNA -DNA but not RNA

DNA but not RNA

Which of the following correctly matches a polymer (listed first) with its respective monomer (listed second)? -Nucleic acid > amino acid -Lipid > fatty acid -Carbohydrate > nucleotide -Protein > monosaccharide

Lipid > fatty acid

Which of the following statements BEST represents the relationship between cellular respiration and photosynthesis? -respiration occurs only in animals and photosynthesis occurs only in plants -photosynthesis stores energy in organic molecules, while respiration releases it -photosynthesis occurs only during the day and respiration occurs only at night -respiration stores energy in organic molecules, while photosynthesis releases it

Photosynthesis stores energy in organic molecules, while respiration releases it

Based on scientific evidence, which of the following is a correct statement about our own evolutionary history. -Modern humans evolved in Africa (130,000 years ago) and then migrated to our current locations -Humans did not evolve from a monkey -All of the above -humans and all other living organisms share a common ancestor -humans evolved from a recent hominin ancestor (i.e., Homo heidelbergensis)

all of the above

Migration will have what kind of effect on the genetic variation between populations? -will not effect variation -increase variation -eliminate all variation -decrease variation

decrease variation

Triglycerides are used primarily for _______________. -information storage -biological catalysis -cell membrane biosynthesis -movement -energy storage

energy storage

Endosymbiotic theory explains the evolution of ___________. -animals -eukaryotic cells -sexual reproduction -DNA

eukaryotic cells

If DNA repair mechanisms were perfect, which of the following would MOST likely result? -evolution as we know it would stop because mutations are the only source of new genetic variation -the rate of evolutionary change would dramatically increase -humans would stop aging, because aging is a collection of DNA mutations -humans would live forever

evolution as we know it would stop because mutations are the only source of new genetic variation

The tiger moth has three phenotypes for the wing coloration gene; homozygous dominant individuals have white spots, homozygous recessive individuals have black spots and heterozygous individuals have gray spots. Therefore, wing coloration in the tiger moth is an example of ________. -codominance -incomplete dominance -a pleiotropic trait -a polygenic trait

incomplete dominance

The pH in the intermembrane space of the mitochondria should be ______ compared with the matrix due to the ______. -higher; higher concentration of protons in the intermembrane space -lower; higher concentration of protons in the intermembrane space -lower; lower concentration of protons in the intermembrane space -higher; lower concentration of protons in the intermembrane space

lower; higher concentration of protons in the intermembrane space

During photosynthesis and cellular respiration, the ___________ forms of electron carriers have low potential energy. -reduced -carboxylated -phosphorylated -oxidized

oxidized

What molecule carries amino acids in the ribosome and is involved in protein translation? -mRNA -RNA polymerase -DNA -tRNA

tRNA

A skin cell in G2 of interphase has _____ as much DNA as it had in G1.

twice

Several chemical properties make water uniquely suited for its role as a central "molecule of life." Which of the following is false? -Hydrogen bonding leads to high cohesiveness between water molecules -Water resists temperature changes -Water is a good solvent of polar molecules and ions -Water molecules are always non-polar -The structure of a water molecule is stabilized by covalent bonds

water molecules are always non-polar