BIOLOGY

Question 1 of 48

3.75 Points

Decondensed chromatin is located within the

A.nucleolus during maintenance

B.nucleus during cell maintenance

C.nucleus during cell division

D.nucleolus during cell division Reset Selection

Mark for Review What’s This?

Question 2 of 48

3.75 Points

The evil arch-villain Dr. Black Thumb has created a new plant pathogen. The microbe has an enzyme allowing it to quickly convert β 1-4 glycosidic linkages to α 1-4 glycosidic linkages in a whole field of plants. If Dr. Black Thumb’s plan is not thwarted, crop harvests could be ruined due to

A.amylose and amylopectin becoming hard and inedible.

B.plant starches becoming rigid and popping cell membranes.

C.

plants flopping over.

D.polysaccharides converting into monosaccharides. Reset Selection

Mark for Review What’s This?

Question 3 of 48

3.75 Points

An atom with an atomic mass of 89 and an atomic number of 39 has how many

neutrons?

A.128

B.2

C.50

D.59 Reset Selection

Mark for Review What’s This?

Question 4 of 48

3.75 Points

What factors allow a pool of 20 amino acids to produce thousands of unique proteins? (Select all that apply.)

A. variation in length of amino acid backbone

B. each protein is encoded by a distinct gene

C. variation in tertiary structure

D. variations in which amino acids are used

E. variations in glycosidic linkage

F. variations in the type of peptide bond

Mark for Review What’s This?

Question 5 of 48

3.75 Points

_________________ prevent material from moving in or out of the brain’s capillaries

A.Desmosomes

B.Plasmodesmatas

C.Gap junctions

D.Tight junctions Reset Selection

Mark for Review What’s This?

Question 6 of 48

3.75 Points

Cardiac muscle requires junctions that allow electrical signals through. Cardiac muscle also relies on calcium to contract. What junction is involved and what organelle stores calcium?

A.desmosomes, smooth ER

B.plasmodesmata, rough ER

C.gap, smooth ER

D.tight, rough ER Reset Selection

Mark for Review What’s This?

Question 7 of 48

3.75 Points

The building blocks of nucleic acids are

A.sugars.

B.nucleotides.

C.peptides.

D.nitrogenous bases. Reset Selection

Mark for Review What’s This?

Question 8 of 48

3.75 Points

Which statements describe sodium atoms? Select all that apply.

A. forms cations

B. closest to the left side of the periodic table

C. easily forms covalent bonds

D. contains 1 valence electron

E. has 2 electrons in the first energy level

F. can lose one electron easily

G. outer energy level is stable

Mark for Review What’s This?

Question 9 of 48

3.75 Points

If an integrin protein is mutated what cell function might be affected?

A.communication between cytoskeleton and proteglycan

B.fluidity of phospholipids

C.cellular motility

D.cytoplasmic communication Reset Selection

Mark for Review What’s This?

Question 10 of 48

3.75 Points

Buffers are important for doing experiments in labs, but they are not relevant to living systems.

True

False

Reset Selection

Mark for Review What’s This?

Question 11 of 48

3.75 Points

The cell theory states

A.all cells will contain DNA, all cells are the smallest living things that can divide and all organisms are composed of cells

B.all organisms are composed of multiple cells, all cells arise spontaneously and all cells require nutrients

C.all cells are the smallest living things, all organisms are composed of one or more cells and all cells arise spontaneously

D.all organisms are composed of one or more cells, all cells are the smallest living things and all cells arise from other cells Reset Selection

Mark for Review What’s This?

Question 12 of 48

3.75 Points

Hiking in the snowy woods, you peek inside a cave and encounter a hibernating grizzly bear! Its metabolic rate seems to be very low. What do you predict is the predominant type of reaction occurring in this bear?

A.fatty acid anabolism

B.carbohydrate catabolism

C.carbohydrate anabolism

D.fatty acid catabolism Reset Selection

Mark for Review What’s This?

Question 13 of 48

3.75 Points

Rosenberg, a chemist, was observing the effects of an electric field on bacterial growth. He observed that bacteria stopped dividing when in an electric field. This research led to the anti-cancer drug cisplatin, a platinum containing compound. Rosenberg’s discovery was an example of

science.

Mark for Review What’s This?

Question 14 of 48

3.75 Points

Enzymes are catalysts in reactions. What statements describe functions of enzymes? Select all that apply.

A. Enzymes are specific in their actions.

B. Once an enzyme binds to a substrate, it cannot be used again.

C. Enzymes lower the energy of activation needed for a reaction

D. Enzymes change the amount of free energy produced

E. Enzyme activity can be affected by temperature.

Mark for Review What’s This?

Question 15 of 48

3.75 Points

In biological macromolecules like proteins, the hydrophobic residues tend to clump together in the interior of the folded structure. What is the best explanation for why this occurs?

A.Polar residues tend to bind to water in the cytoplasm as well as to each other. The water and polar residues cannot bind to the hydrophobic ones, so in the lowest energy state the hydrophobic residues are pushed together in the middle.

B.Protein folding machinery interprets the amino acid code to pack hydrophobic residues into the center of proteins. This process must be important, because the cell expends large amounts of ATP to precisely coordinate protein folding.

C.Hydrophobic residues bind to each other in specific ways. For instance, Ala forms di-methyl bonds, and phenylalanine binds isoleucine. This creates a tightly bound hydrophobic inner core.

D.Hydrophobic residues bind each other, while polar residues cannot bind each other. Therefore the hydrophobic ones end up stuck to each other in the core of the protein. Reset Selection

Mark for Review What’s This?

Question 16 of 48

3.75 Points

If two solutions are different, the one will the higher concentration of solutes is

A.isotonic

B.hypertonic

C.hypotonic Reset Selection

Order now and get 10% discount on all orders above $50 now!!The professional are ready and willing handle your assignment.

ORDER NOW »»