DAT Practice Test (Survey of Natural Sciences)

Question 1

Which organelle in a eukaryotic cell makes transport vesicles for exocytosis?

Accepted Answer

Golgi Body

Answer

Smooth Endoplasmic Reticulum

Answer

Ribosome

Answer

Mitochondria

Answer

Rough Endoplasmic Reticulum

Question 2

The reaction quotient (Q) for a reaction involving nitrogen monoxide within a sealed flask was determined to be 1.1 × 10² at one point. Which reaction is most likely taking place in the flask if the amount of NO gas in the flask increased after this point?

Accepted Answer

N2(g) + O2(g) ↔ 2NO(g) Kc = 4.2 × 102

Answer

NOBr(g) ↔ NO(g) + ½Br2(g) Kc = 3.4 × 10-2

Answer

2NO(g) + 2H2(g) ↔ N2(g) + 2H2O(g) Kc = 4.0 × 106

Answer

2NOCl(g) ↔ 2NO(g) + Cl2(g) Kc = 1.6 × 10-5

Question 3

When reacted with benzene, which of the following will produce an ortho/para configuration?

Accepted Answer

2 of the below

Answer

NO2

Answer

-COOH

Answer

-Cl

Answer

-CH3

Question 4

In humans, cystic fibrosis is a recessive disease. What is the probability that a kid would be born with the condition if one parent is a carrier of the trait and the other parent is homozygous dominant, according to the principles of classical Mendelian genetics?

Accepted Answer

0%

Answer

75%

Answer

100%

Answer

50%

Answer

25%

Question 5

The cytosol's typical pH is at 7.2. The majority of enzymes in the lysosome, on the other hand, are only active at pH 5. This implies that

Accepted Answer

protons are actively pumped into the lysosome

Answer

enzymes in the lysosome are released to the cytosol

Answer

most enzymes in the lysosome are incapable of catalyzing substrates inside the lysosome

Answer

enzymes in the lysosome are released to the cytosol

Question 6

A compound is fully made up of silicon and oxygen atoms. What is the empirical formula of a compound containing 14.00 g of silicon and 32.0 g of oxygen?

Accepted Answer

SiO4

Answer

Si2O3

Answer

Si2O

Answer

Si2O4

Answer

SiO2

Question 7

Which of the following functional groups has the highest priority in IUPAC nomenclature when numbering a parent chain?

Accepted Answer

Esters

Answer

Alkynes

Answer

Alkenes

Answer

Amines

Answer

Alkanes

Question 8

Multiple binding sites exist on __________ enzymes.

Accepted Answer

Allosteric

Answer

Catalytic

Answer

Regulatory

Answer

Competitive

Answer

Non-competitive

Question 9

Caffeine can attach to the adenosine receptor but cannot activate it since its structure is very similar to that of adenosine. When caffeine binds to the adenosine receptor, which of the following best characterizes the effect?

Accepted Answer

Caffeine blocks the effect of adenosine by preventing the binding of adenosine to the adenosine receptor

Answer

Caffeine enhances the effect of adenosine, overstimulating the adenosine signal transduction pathway and ultimately causing it to fail

Answer

Caffeine has no effect on the activity of adenosine

Answer

Caffeine restores the effect of adenosine by substituting for it as a signaling molecule

Question 10

N₂(g) + O₂(g) + Cl₂(g) ↔ 2NOCl(g) ΔG° = 132.6 kJ/mol
What would happen to the value of ΔG° in the equilibrium below if the concentration of N2 were to increase, and why?

Accepted Answer

It would stay the same because the value of Keq would not change

Answer

It would decrease because there are more reactants present

Answer

It would increase as the reaction would become more thermodynamically favoured

Answer

It would increase as the reaction would shift right and create more products