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Flashcards in Biology Exam Deck (49)
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1

Accomplishments of Franklin and Wilkins

Determined DNA was twisted and molecules arranged at regular intervals using x rays

2

Accomplishments of Chargaff

Determined adenine pairs with thymine, cytosine pairs with guanine (called complementary base pairing rule or Chargaffs rule)

3

Four differences in DNA and RNA

1. DNA -thymine, RNA uracil
2. DNA double stranded, RNA single stranded
3. DNA controls daily functions RNA messenger
4. DNA replicates, RNA transcribes

4

Whats nondisjuction

Failure of chromosomes to separate properly during meiosis (anaphase), resulting zygotes have too few or too many chromosomes

5

Whats hemophilia

Impairs bloods ability to clot
Blood missing clotting factor called factor 8 or 9 or AHF (antihemophilic factor)

6

Name the zones of the ocean

Oceanic, photic, aphotic, neuritic, intertidal

7

Oceanic zone

Deep water part of ocean, 2 parts, pelagic and benthic zone

8

Photic zone

Photosynthesis occurs here because it receives sunlight

9

Aphotic zone

Sunlight can't penetrate and photosynthesis can't occur

10

Neritic zone

Most productive part of ocean because if supports more organisms than any other zone, water shallow enough for photosynthesis to occur, most seafood harvested here, off coasts of all continents

11

Intertidal zone

Most difficult for organisms to live in because they have to adapt to periodic exposure to sir during low tide and have to withstand the force of crashing wave, tide comes in and out

12

Tundra

Permafrost (permanently frozen layer of soil under the surface, snow year round , northernmost biome

13

Taiga

Coniferous trees (pines, furs, spruces), Canada and Northern Asia

14

Deciduous forest

We live here, trees lose leaves in winter

15

Grassland

Too dry to support trees, interior of continents, turned into farmland

16

Tropical rainforest

200 to 400 cm of rain each year, large diversity of life on earth

17

Desert

Recieved less than 25 cm of rain a year, hot or cold desert

18

Anther

Structure where male gametophytes are produced

19

Pistil

Female part of the flower, made of 3 parts, collectively called carpels

20

Filament

Long, thin structure that supports the anther

21

Ovary

Hollow structure at the base of the pistil that contains the ovules

22

Style

Stalk rising from the ovary of a pistil

23

Stigma

Swollen, sticky tip of pistil that contains the ovules

24

Pollen grain

Male gametophyte, contains sperm

25

Ovule

Female gametophyte that produces eggs

26

Stamen

Male part of the flower, made of 2 parts

27

Corolla

Petals collectively

28

Calyx

All sepals collectively

29

Sepals

Outermost whorl of leaves, usually green

30

What are the three root types, examples

Taproots (carrots, radishes), fibrous root system (grasses), adventitious roots( roots grow from stems and leaves, above ground)