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Which of these hormones is a steroid?

1. AGlucagon
2. BGrowth hormone
3. CInsulin
4. DTestosterone

What does transfer RNA (tRNA) do?

1. AIt brings amino acids to the ribosome
2. BIt copies DNA in the nucleus
3. CIt carries the code out of the nucleus
4. DIt joins two DNA strands together

Apa tujuan kelompok kontrol?

1. AMenerima dosis terbesar dari perlakuan yang diuji
2. BMemberi acuan dasar untuk perbandingan dengan kelompok yang diberi perlakuan
3. CMembuat percobaan selesai lebih cepat
4. DMenggantikan kebutuhan akan hipotesis

Pernyataan mana yang menggambarkan transpor aktif?

1. AMemakai energi untuk memindahkan zat melawan gradien konsentrasi
2. BHanya terjadi pada sel mati
3. CMemindahkan zat menurut gradien konsentrasinya tanpa memakai energi apa pun
4. DHanya memindahkan air melalui membran

There are 64 possible codons but only about 20 amino acids. What does this tell you about the genetic code?

1. AMost amino acids are coded for by more than one codon
2. BEach codon codes for more than one amino acid at the same time
3. CEach amino acid has exactly three codons
4. DOnly 20 of the codons are ever used

Which DNA bases are purines?

1. AAdenine and guanine
2. BAdenine and thymine
3. CCytosine and guanine
4. DCytosine and thymine

Liver cells take in cholesterol-carrying LDL particles only after the particles bind to specific proteins on the cell surface. Which process is this?

1. AReceptor-mediated endocytosis
2. BExocytosis
3. CPinocytosis of extracellular fluid
4. DSimple diffusion

An old idea says giraffes got long necks because each one stretched to reach leaves and passed the longer neck to its young. Why is this idea rejected?

1. AOnly plants can pass on traits to offspring
2. BChanges acquired in a lifetime are not passed on in the genes
3. CNeck length is not affected by any genes
4. DGiraffes do not eat leaves from tall trees, so stretching is not needed