Question

question 1
1 pts
materials can be moved from a low concentration to a high concentration through:
○ facilitated diffusion.
○ filtration.
○ osmosis.
○ active transport.
question 2
1 pts
the pairing of bases of a strand of dna is obligatory. if a strand of dna were composed of the base sequence of atcg, what would be the obligatory sequence of its opposing base pairs?
○ tagc
○ cgat
○ gcta
○ atcg
question 3
1 pts
a sequence of three bases forms a(n):
○ codon.
○ anticodon.
○ amino acid.
○ polypeptide bond.

Explanation:

• Question 1: Active transport moves substances against the concentration - gradient (from low to high concentration). Facilitated diffusion, filtration, and osmosis move substances along the concentration - gradient.
• Question 2: In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). So, for the sequence ATCG, the complementary sequence is TAGC.
• Question 3: A sequence of three bases on mRNA is called a codon. An anticodon is on tRNA, an amino acid is the building - block of proteins, and a polypeptide bond links amino acids.

Answer:

Question 1: active transport
Question 2: TAGC
Question 3: codon