Užduočių lapas tema Biologija slaugos stojamiesiems egzaminams su atsakymais

What does it mean that a cell membrane is selectively permeable?

1. AIt lets every substance cross freely in both directions
2. BIt lets no substance cross at all
3. CIt lets some substances cross but not others
4. DIt lets only water molecules cross

What do receptor proteins in the cell membrane do?

1. AThey store the cell's genetic code for making proteins
2. BThey digest bacteria that enter the cell
3. CThey make ATP for the cell
4. DThey bind specific signal molecules, such as hormones

Dauguma fermentų priklauso kuriai biomolekulių grupei?

1. AMineralinėms medžiagoms
2. BLipidams
3. CAngliavandeniams
4. DBaltymams

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

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

Kuo sotieji riebalai skiriasi nuo nesotųjų riebalų?

1. AJie turi daug dvigubų ryšių ir kambario temperatūroje yra skysti
2. BJie lengvai tirpsta vandenyje
3. CJie neturi C=C dvigubų ryšių ir paprastai yra kieti
4. DJie turi azoto ir sudaro baltymus

What do nitrogen-fixing bacteria do?

1. AThey break down proteins into glucose
2. BThey release nitrogen gas from dead organisms into the air
3. CThey convert nitrogen gas into compounds that plants can use
4. DThey turn carbon dioxide into sugar

Ignoring crossing over, how many different combinations of chromosomes can one person's gametes have because of independent assortment?

1. A23², about 529
2. B2²³, about 8 million
3. C46, one for each chromosome
4. D2 × 23, which is 46

In an onion root tip, 90 of 100 cells are in interphase and 10 are in mitosis. If the whole cell cycle takes 20 hours, about how long does mitosis last?

1. A2 hours
2. B0,5 hours
3. C18 hours
4. D10 hours