AP BIO

posted by .

A fully illuminated plant was placed in an atmosphere containing CO2 composed of radioactive carbon. Then the atmosphere surrounding the plant was exchanged for air containing no radioactive carbon, and the plant was placed in total darkness. When the atmosphere surrounding the plant was sampled for radioactive carbon dioxide at various times after the plant was placed in total darkness, the following data were obtained.

Time (hr.) 1 2 3 4
CPM (counts/min.) 40 86 126 159


Which one of the following is the most likely interpretation?

1 Plants cannot respire in the dark.

2 Respiration was occurring in the dark.

3 Respiration, but not anaerobic glucose breakdown occurs in the dark.

4 Fermentation and glucose breakdown were occurring in the dark.

5 The interpretation provided in choices 2 and 4 are equally valid.

  • AP BIO -

    ki

  • AP BIO -

    The answer is 3, I know that for sure

  • AP BIO -

    How many 14C atomsareincorporated in to laminate whenever fatty acid synthesis is carried out with the following labelled substrate?why?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Environmental Science

    1. How are carbon emissions related to the carbon that accumulates in the atmosphere?
  2. Bio

    A biologist was experimenting with a corn plant that had previously incorporated radioactive carbon into starch stored in its cells. She measured the radioactivity present in the following compounds: Sugar extracted from the plant …
  3. Chemistry

    (a) The total mass of carbon contained in fossil fuels that was burned in the world from 1750 to 2000 was estimated to be 2.9 x E14 kg C. The amound of carbon released as carbon dioxide from agricultural expansion and deforestation …
  4. science - biology

    A photosynthesis experiment uses Chlorella to track the route taken by 14C in photosynthesis. The 14C is provided from CO2 and no new sources of CO2 are available. After the experiment the scientist extracts all of the starch produced …
  5. biology

    14 points Save A photosynthesis experiment uses Chlorella to track the route taken by 14C in photosynthesis. The 14C is provided from CO2 and no new sources of CO2 are available. After the experiment the scientist extracts all of the …
  6. algebra

    Scientists can determine the age of ancient objects by a method called radio carbon dating. The bombardment of the upper atmosphere by cosmic rays converts nitrogen to a radioactive isotope 14C of carbon with a half-life of about 5710 …
  7. Plz help me.

    Which of the following explains why your body may contain a carbon atom that was present in George Washington’s body in 1776?
  8. Physics

    A gram of living plant material with Carbon-14 , decays at a rate of about 16 disintegrations per minute. When the plant dies, the Carbon-14 decays, with a half-life of 5600 years. A gram of the dead plant is found to decay at about …
  9. chemistry

    Which of the following is NOT true about a nuclear power plant?
  10. Biology

    If plants need oxygen for cellular respiration, then why do plants release oxygen into the atmosphere?

More Similar Questions