Which of the following organic molecules contain both an amine and carboxyl group?

A. Lipids

B. Proteins

C. Chitin

D. Cellulose

Answer Explanation:

An amine group is a nitrogen atom bonded to three hydrogen atoms, and a carboxyl group is a carbon atom double-bonded to an oxygen atom and single-bonded to a hydroxyl group. These groups are important for the formation of amino acids, which are the building blocks of proteins.

Therefore, the Correct Answer is B.

Q #1: In a certain plant, red flowers are dominant over white flowers. A plant heterozygous for red flowers and a plant with white flowers are crossed. Which of the following is the expected proportion of phenotypes in the next generation?

A. 1 red, 3 white

B. 4 red, 0 white

C. 2 red, 2 white

D. 3 red, 1 white

Answer Explanation

The law of segregation states that each individual has two alleles for each trait, and these alleles separate during gamete formation. The allele that each gamete receives is random. Therefore, the probability of getting a certain genotype or phenotype depends on the Punnett square. In this case, the plant heterozygous for red flowers has the genotype Rr, where R is the dominant allele for red flowers and r is the recessive allele for white flowers. The plant with white flowers has the genotype rr. half of the offspring will have the genotype Rr and half will have the genotype rr. Since R is dominant over r, the offspring with Rr will have red flowers and the offspring with rr will have white flowers. Therefore, the expected proportion of phenotypes in the next generation is 2 red, 2 white.
Q #2: Which of the following substances is responsible for donating H+ ions to act as a buffer when blood pH rises?

A. Carbon dioxide

B. Carbonic acid

C. Oxygen

D. Carbon monoxide

Answer Explanation

A buffer is a solution that can resist changes in pH when small amounts of acid or base are added. In the human body, blood is an important buffer that helps maintain a stable pH of about 7.4. One of the main components of the blood buffer system is the bicarbonate buffer, which involves the equilibrium between carbon dioxide (CO2), carbonic acid (H2CO3), and bicarbonate ions (HCO3-). When blood pH rises, meaning it becomes more basic, the bicarbonate buffer can donate H+ ions to lower the pH and restore the balance. The substance that donates H+ ions in this case is carbonic acid, which dissociates into H+ and HCO3-. Therefore,
Q #3: Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell?

A. Lysozymes

B. Perforin

C. Cytokines

D. Granzymes

Answer Explanation

Cytokines are small proteins that act as chemical messengers between different types of immune cells. They can stimulate or inhibit the activation, proliferation, differentiation, and migration of immune cells. For example, interleukins are a type of cytokine that is produced by one type of white blood cell and can affect the behavior of another type of white blood cell. Lysozymes, perforin, and granzymes are all molecules that are involved in killing pathogens or infected cells, but they do not directly activate other immune cells.

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Which of the following organic molecules contain both an amine and carboxyl group?

More Questions on TEAS 7 Science

Q #1: In a certain plant, red flowers are dominant over white flowers. A plant heterozygous for red flowers and a plant with white flowers are crossed. Which of the following is the expected proportion of phenotypes in the next generation?

Answer Explanation

Q #2: Which of the following substances is responsible for donating H+ ions to act as a buffer when blood pH rises?

Answer Explanation

Q #3: Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell?

Answer Explanation

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